diff options
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-designware.c | 26 |
1 files changed, 17 insertions, 9 deletions
diff --git a/drivers/i2c/busses/i2c-designware.c b/drivers/i2c/busses/i2c-designware.c index 5a3bd74c81d..f184d822d3d 100644 --- a/drivers/i2c/busses/i2c-designware.c +++ b/drivers/i2c/busses/i2c-designware.c @@ -90,6 +90,11 @@ #define DW_IC_INTR_START_DET 0x400 #define DW_IC_INTR_GEN_CALL 0x800 +#define DW_IC_INTR_DEFAULT_MASK (DW_IC_INTR_RX_FULL | \ + DW_IC_INTR_TX_EMPTY | \ + DW_IC_INTR_TX_ABRT | \ + DW_IC_INTR_STOP_DET) + #define DW_IC_STATUS_ACTIVITY 0x1 #define DW_IC_ERR_TX_ABRT 0x1 @@ -347,13 +352,16 @@ static void i2c_dw_xfer_init(struct dw_i2c_dev *dev) /* Enable the adapter */ writel(1, dev->base + DW_IC_ENABLE); + + /* Enable interrupts */ + writel(DW_IC_INTR_DEFAULT_MASK, dev->base + DW_IC_INTR_MASK); } /* - * Initiate low level master read/write transaction. - * This function is called from i2c_dw_xfer when starting a transfer. - * This function is also called from i2c_dw_isr to continue a transfer - * that is longer than the size of the TX FIFO. + * Initiate (and continue) low level master read/write transaction. + * This function is only called from i2c_dw_isr, and pumping i2c_msg + * messages into the tx buffer. Even if the size of i2c_msg data is + * longer than the size of the tx buffer, it handles everything. */ static void i2c_dw_xfer_msg(struct dw_i2c_dev *dev) @@ -365,7 +373,7 @@ i2c_dw_xfer_msg(struct dw_i2c_dev *dev) u32 buf_len = dev->tx_buf_len; u8 *buf = dev->tx_buf;; - intr_mask = DW_IC_INTR_STOP_DET | DW_IC_INTR_TX_ABRT | DW_IC_INTR_RX_FULL; + intr_mask = DW_IC_INTR_DEFAULT_MASK; for (; dev->msg_write_idx < dev->msgs_num; dev->msg_write_idx++) { /* if target address has changed, we need to @@ -405,11 +413,12 @@ i2c_dw_xfer_msg(struct dw_i2c_dev *dev) if (buf_len > 0) { /* more bytes to be written */ - intr_mask |= DW_IC_INTR_TX_EMPTY; dev->status |= STATUS_WRITE_IN_PROGRESS; break; - } else + } else { dev->status &= ~STATUS_WRITE_IN_PROGRESS; + intr_mask &= ~DW_IC_INTR_TX_EMPTY; + } } writel(intr_mask, dev->base + DW_IC_INTR_MASK); @@ -479,7 +488,6 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) /* start the transfers */ i2c_dw_xfer_init(dev); - i2c_dw_xfer_msg(dev); /* wait for tx to complete */ ret = wait_for_completion_interruptible_timeout(&dev->cmd_complete, HZ); @@ -687,7 +695,7 @@ static int __devinit dw_i2c_probe(struct platform_device *pdev) i2c_dw_init(dev); writel(0, dev->base + DW_IC_INTR_MASK); /* disable IRQ */ - r = request_irq(dev->irq, i2c_dw_isr, 0, pdev->name, dev); + r = request_irq(dev->irq, i2c_dw_isr, IRQF_DISABLED, pdev->name, dev); if (r) { dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq); goto err_iounmap; |